Underhill NG550-DFL-75 Magnum UltraMax Turbo Shift Hose Nozzle, 3/4-Inch FHT Inlet, Low Flow, Dual Variable Flow Dual variable flow - delivers light fog and low volume jet stream patterns before shifting to high volume jet stream and fan patterns Opens at 7 to 12 gallons per minute (GPM) and can be "turbo shifted" to 14 to 17 GPM Recommended for commercial and residential use with lower pressure, minimum 50+ psi needed Firefighter quality nozzle is made of aircraft aluminum, stainless steel and TPR rubber Use with UltraMax pistol grip or firefighter grip valve (sold separately, items SV or SVPG)